A method and system for dynamically updating geospatial data based on remote sensing images

Abstract

The invention discloses a method and a system for dynamically updating geographic space data based on a remote sensing image. The method comprises the steps of preprocessing an image, identifying change information, performing filtering to eliminate noise, extracting the boundary of a changed area, generating a vector boundary diagram of an image change feature, regularizing the boundary of the feature, segmenting update data based on the principle of quad-tree spatial index to locate the changed area quickly, identifying the change type of elements based on a neural decision tree method, extracting the change type, and updating and storing the change information in an original database. According to the invention, a simple, quick and accurate change detection method is obtained. By adoption of the quad-tree grid partition mode, the speed and precision of retrieval are improved. The boundary of the changed area extracted by an IGAC-based extraction method is more accurate.

Description

technical field [0001] The invention relates to the technical field of geographic information, in particular to a method and system for dynamically updating geographic space data based on remote sensing images. Background technique [0002] With the rapid advancement of the urbanization process, the urban surface morphology is changing faster and faster. The development and utilization of the surface landscape and the land cover changes caused by it have become an important part of the global environmental change. The change of the surface is closely related to the development of the city, and the change information needs to be applied to departmental decision-making in a timely manner. In order to meet the data requirements of relevant departments, the spatial data must be updated dynamically in time to ensure the current situation, accuracy and applicability of the data. Spatial data update is the main means to maintain the current status of spatial database, so it is of ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the fact that the existing change detection methods cannot be fast and simple, the present invention provides a method and system for dynamically updating geospatial data based on remote sensing images. Based on the combination of multiple methods to improve the accuracy of change detection, an image algebraic method is proposed. The idea of ​​combining with the change vector analysis method combines the advantages of the image algebra method and the change vector analysis method to obtain a simple, fast and accurate change detection method

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